Numerical Analysis of Tunnel Excavation Method at Greatly Cross Undermine Huangzhuang Station of Beijing Subway

2011 ◽  
Vol 243-249 ◽  
pp. 5789-5793
Author(s):  
Jin Shui Xie ◽  
Ming Zhou Bai ◽  
Zhao Yi Xu ◽  
Ming Xing Xu ◽  
Zhu Shi ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Numerical Analysis ◽  
Surface Deformation ◽  
Ground Surface ◽  
Side Wall ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Geological Conditions ◽  
Numerical Calculation Method ◽  
Beijing Subway

Combined with the geological conditions and the project features, the selection problem of pilot tunnel construction method of Huangzhuang station is solved. Directing at the commonly used method including CD method, CRD method and double side wall pilot tunnel method, FLAC3D numerical calculation method is adapted to analysis and predict the ground surface deformation and supporting structure hand features. Through analyzing the size and law of surface settlement in this section, the feasibility and differences of these methods is concluded and analyzed. And finally an example is given.

scholarly journals Numerical Analysis of Soil Settlement Prediction and Its Application In Large-Scale Marine Reclamation Artificial Island Project

2017 ◽  
Vol 24 (s3) ◽  
pp. 4-11 ◽  
Author(s):  
Jie Zhao ◽  
Lingyun Bao ◽  
Guixuan Wang
Keyword(s):  
Numerical Calculation ◽  
Numerical Analysis ◽  
Large Scale ◽  
Structural Characteristics ◽  
Silty Clay ◽  
Two Dimensional ◽  
Analysis Method ◽  
One Dimensional ◽  
Soil Settlement ◽  
Numerical Calculation Method

Abstract In an artificial island construction project based on the large-scale marine reclamation land, the soil settlement is a key to affect the late safe operation of the whole field. To analyze the factors of the soil settlement in a marine reclamation project, the SEM method in the soil micro-structural analysis method is used to test and study six soil samples such as the representative silt, mucky silty clay, silty clay and clay in the area. The structural characteristics that affect the soil settlement are obtained by observing the SEM charts at different depths. By combining numerical calculation method of Terzaghi’s one-dimensional and Biot’s two-dimensional consolidation theory, the one-dimensional and two-dimensional creep models are established and the numerical calculation results of two consolidation theories are compared in order to predict the maximum settlement of the soils 100 years after completion. The analysis results indicate that the micro-structural characteristics are the essential factor to affect the settlement in this area. Based on numerical analysis of one-dimensional and two-dimensional settlement, the settlement law and trend obtained by two numerical analysis method is similar. The analysis of this paper can provide reference and guidance to the project related to the marine reclamation land.

Tunnel Prospecting Based on Integrated Interpretation of Geophysical Data: Xiangyun Tunnel, Yunnan Province, China

2019 ◽  
Vol 24 (1) ◽  
pp. 63-75
Author(s):  
Lei Chen ◽  
Fengkai Zhang ◽  
Yuxiao Ren ◽  
Xinji Xu ◽  
Zhichao Yang ◽  
...  
Keyword(s):  
Yunnan Province ◽  
Geological Mapping ◽  
Tunnel Construction ◽  
Tunnel Excavation ◽  
Horizontal Drilling ◽  
Adverse Conditions ◽  
Transient Electromagnetic ◽  
Geological Conditions ◽  
Electromagnetic Soundings ◽  
Integrated Interpretation

With China's expanding economy, many tunnels are being designed and constructed. However, tunneling in hazardous geologic terrain, with faults, fractures, water-bearing openings, and other adverse geological conditions, construction safety is seriously endangered. To ensure the safety of tunnel construction, a tunnel geological prospecting method was proposed and applied at the Xiangyun Tunnel in Yunnan Province, China. In the investigation stage, the engineering geological and hydrogeological conditions were analyzed to recognize high-risk sections. In the construction stage, the “tunnel ahead” prospecting scheme was optimized based on the macroscopic geological conditions. Geological mapping of the tunnel, seismic ahead prospecting and transient electromagnetic soundings were employed as well as resistivity models to image potential adverse conditions. Horizontal drilling and tunnel excavation records verified the geophysical predictions and interpretations.

Finite Element Analysis for the Displacement Characteristics of Loess Tunnel with Weak Surrounding Rock

2012 ◽  
Vol 487 ◽  
pp. 64-68
Author(s):  
Qian Zhang ◽  
Hai Xia Zhang ◽  
Jin Xing Lai
Keyword(s):  
Surface Deformation ◽  
Surrounding Rock ◽  
Tunnel Construction ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Qinghai Province ◽  
Elastic Plastic ◽  
Excavation Process ◽  
Reinforcement Measures ◽  
Weak Surrounding Rock

Backed up by Dayoushan loess tunnel of Xining in Qinghai province, the displacements of vault settlement, peripheral convergence, surface deformation and post-construction settlement caused by tunnel construction are numerically simulated and analyzed. First, 2-D elastic-plastic model is founded to simulate the tunnel excavation process with up and down steps method. Second, considering the rheological characteristics of loess, 2-D visco-elastic-plastic constitutive model is founded to simulate the creep deformation of rock displacement characteristics. Finally, combined with the serious collapsible feature of loess foundation in supported project, the post-construction settlements under different conditions are simulated to obtain the settlement values of tunnel vault and bottom. The results can explain the deformation laws of tunnel displacement characteristics reasonably and show the importance of foundation reinforcement measures for loess tunnel.

Comparison for Support Patterns of Temporary Shaft for Construction in Silty Clay

2012 ◽  
Vol 204-208 ◽  
pp. 1809-1816
Author(s):  
Yi Xiao Cui ◽  
Jian Jia ◽  
Shun Hua Zhou
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Reference Value ◽  
Simulation Method ◽  
Calculation Model ◽  
Silty Clay ◽  
Geological Condition ◽  
Geological Conditions ◽  
Cut Method ◽  
Bored Piles

Based on a temporary shaft for construction, this paper compared two supporting patterns in the geological condition dominated by silty clay, the open-cut method with tunneling support and the bored piles supporting method, in the respects of ground surface deformation, the envelope structure deformation and the steel brace forces, using the numerical simulation method. And by comparison of the numerical results with the monitoring data, it is verified that the calculation model and methods of analysis are rational. Furthermore, the open-cut method with tunneling support is recommended as the better supporting method that can both ensure the structure safety and economy in areas of similar geological conditions. The paper has some reference value for shaft supports under similar construction conditions.

Monitoring and Numerical Simulation of the Supporting of the Inverted Side Wall Shaft

2013 ◽  
Vol 671-674 ◽  
pp. 69-75
Author(s):  
Ai Jun Yao ◽  
Chao Mei ◽  
Huan Fang Chen
Keyword(s):  
Numerical Simulation ◽  
Surface Deformation ◽  
Ground Surface ◽  
Side Wall ◽  
Monitoring Data ◽  
Retaining Structure ◽  
Site Monitoring ◽  
Excavation Process ◽  
Ground Surface Settlement ◽  
3D Software

Base on the shaft construction of a subway station in Changchun, make a detailed analysis of the site monitoring data of the retaining structure and the ground surface settlement against the excavation process of the inverted side wall shaft. By using the FLAC-3D software of finite difference, the numerical simulation are conducted, thus, make a comparison with the site monitoring data, and summarize the deformation characteristics of the retaining structure and the surface deformation of the inverted side wall shaft during the excavation. Results show that the support of the inverted side wall shaft which adopting alternation excavation and supporting while excavating has good stability, and the monitoring result is close to the numerical simulation’s, which provides the basis for the success of the engineering.The research results can be references for other similar designs and constructions.

Control Standard of Ground Surface Settlement Induced by Running Tunnel Construction in Beijing Subway

2011 ◽  
Vol 117-119 ◽  
pp. 721-725 ◽  
Author(s):  
Cheng Ping Zhang ◽  
Li Min Li ◽  
He Li ◽  
Jian Chen Wang
Keyword(s):  
Numerical Simulation ◽  
Ground Surface ◽  
Control Valve ◽  
Surface Settlement ◽  
Tunnel Construction ◽  
Ground Settlement ◽  
Simulation Based ◽  
Ground Surface Settlement ◽  
Subway Construction ◽  
Beijing Subway

Ground settlement, especially the ground surface settlement induced by subway tunneling is an important issue. However, there is no an agreed standard for controlling ground surface settlement during the subway construction at present. The control standard of ground surface settlement was studied using the methods of statistical analysis and numerical simulation based on the running tunnel in Beijing subway. According to the research results, a conclusion could be obtained that the ground surface settlement can be controlled within 40 mm using the general construction measures in Beijing subway running tunnel construction, and furthermore, the settlement of 40mm will not damage the existing nearby structures and utilities including neighboring buildings, bridges and pipelines, etc. So the control valve of 40 mm is rational, which can be adopted as the control standard of ground surface settlement induced by running tunnel construction in Beijing subway.

Analysis of the Ground Surface Settlement of Metro Tunnel by Using Peck Formula

2014 ◽  
Vol 1065-1069 ◽  
pp. 414-420
Author(s):  
Xiong Fei Yang ◽  
Hong Yuan ◽  
Jia Yu Wu ◽  
Hou Mei Zhang
Keyword(s):  
Surface Deformation ◽  
Ground Surface ◽  
Surface Subsidence ◽  
Central Point ◽  
Surface Settlement ◽  
Point Method ◽  
Linear Regression Method ◽  
Tunnel Excavation ◽  
Ground Surface Settlement ◽  
Ground Surface Subsidence

Based on the peck formula, this paper has analyzed measured data of ground surface subsidence, and get the regression curve of ground surface subsidence. Expression for degree of reliability of the maximum ground surface settlement is derived analytically by using central-point method. On the basis of a certain section of tunnel of Guangzhou subway constructed by mining excavation method, linear regression method can be effectively fitting the ground surface deformation data due to tunnel excavation. The central-point method provides a new way for reliability analysis of the ground surface settlement of shield construction.

Tunnel behaviour associated with the weak Alpine rock masses of the Driskos Twin Tunnel system, Egnatia Odos Highway

2013 ◽  
Vol 50 (1) ◽  
pp. 91-120 ◽  
Author(s):  
N. Vlachopoulos ◽  
M.S. Diederichs ◽  
V. Marinos ◽  
P. Marinos
Keyword(s):  
Numerical Models ◽  
Three Dimensional ◽  
Monitoring Data ◽  
Tunnel Construction ◽  
Weak Rock ◽  
Rock Masses ◽  
Tunnel Excavation ◽  
Twin Tunnel ◽  
Geological Conditions ◽  
Weak Rock Masses

Based on the excessive deformations and support failure encountered during tunnel construction at the Driskos Twin Tunnel site in Northern Greece, this paper provides insight on how tunnels designed in such weak rock environments can be realistically analyzed with a view of determining better analytical tools to predict deformations and improving current design methods. Specific factors that were assessed include rock strength based on the geological strength index (GSI), tunnel deformation, numerical analysis techniques employed, three-dimensional model type, support considerations, dilation, sequencing of tunnel excavation, influence of single bore construction on twin bore, and homogenization of tunnel faces. This work involves the use of nominally identical two- and three-dimensional numerical models of tunnel sequencing for analytical simulation of weak material behaviour and sequential tunnel deformation response with the goal of investigating the strength and deformation of such weak rock masses. These have been used in combination with monitoring data that were obtained in the field during the Driskos Twin Tunnel construction. A discussion of the geological conditions, material property determination, monitoring data, and model calibration strategy is given. This paper provides insight into these issues and poses many more fundamental questions regarding the analysis of tunnel excavation within weak rock masses requiring further investigation.

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